Function openxr_sys::xrEnumerateEnvironmentBlendModes

pub unsafe extern "C" fn xrEnumerateEnvironmentBlendModes(
    instance: Instance, 
    system_id: SystemId, 
    environment_blend_mode_capacity_input: u32, 
    environment_blend_mode_count_output: *mut u32, 
    environment_blend_modes: *mut EnvironmentBlendMode
) -> Result